<template>
  <div class="shopcart">
    <div class="content" @click="toggleList">
      <div class="content-left">
        <div class="logo-wrapper">
          <div class="logo" :class="{'highlight':totalCount>0}"><i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i></div>
          <div class="num" v-show="totalCount>0">{{totalCount}}</div>
        </div>
        <div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
        <div class="desc">另需配送费￥{{deliveryPrice}}元</div>
      </div>
      <div class="content-right" @click.stop.prevent="pay">
        <div class="pay" :class="payClass">
          {{payDesc}}
        </div>
      </div>
    </div>
    <div class="ball-container">
      <div transition="drop" v-for="ball in balls" v-show="ball.show" class="ball">
        <div class="inner inner-hook"></div>
      </div>
    </div>
    <div class="shopcart-list" v-show="listShow" transition="fold">
      <div class="list-header">
        <div class="title">购物车</div>
        <span class="empty" @click="empty">清空</span>
      </div>
      <div class="list-content" v-el:list-content>
        <ul>
          <li class="food" v-for="food in selectFoods">
            <span class="name">{{food.name}}</span>
            <div class="price">
              <span>￥{{food.price*food.count}}</span>
            </div>
            <div class="cartControl-wrapper">
              <cartcontrol :food="food"></cartcontrol>
            </div>
          </li>
        </ul>
      </div>
    </div>
  </div>
  <div class="list-mask" @click="hideList" v-show="listShow" transition="fade">

  </div>
</template>

<script type="text/ecmascript-6">
  import cartcontrol from 'components/cartcontrol/cartcontrol';
  import BScroll from 'better-scroll';

  export default {
    props: {
      selectFoods: {
        type: Array,
        default() {
          return [];
        }
      },
      deliveryPrice: {
          type: Number,
          default: 0
      },
      minPrice: {
        type: Number,
        default: 0
      }
    },
    data() {
        return {
            balls: [
                {
                  show: false
                },
                {
                  show: false
                },
                {
                  show: false
                },
                {
                  show: false
                },
                {
                  show: false
                }
            ],
            dropBalls: [],
            fold: true
        };
    },
    computed: {
      totalPrice() {
        let total = 0;
        this.selectFoods.forEach((food) => {
            total += food.price * food.count;
        });
        return total;
      },
      totalCount() {
        let count = 0;
        this.selectFoods.forEach((food) => {
          count += food.count;
        });
        return count;
      },
      payDesc() {
        if (this.totalPrice === 0) {
          return `￥${this.minPrice}元起送`;
        } else if (this.totalPrice < this.minPrice) {
          let diff = this.minPrice - this.totalPrice;
          return `还差￥${diff}元起送`;
        } else {
          return '去结算';
        }
      },
      payClass() {
        if (this.totalPrice < this.minPrice) {
            return 'not-enough';
        } else {
          return 'enough';
        }
      },
      listShow() {
          if (!this.totalCount) {
            this.fold = true;
            return false;
          }
          let show = !this.fold;
          if (show) {
            this.$nextTick(() => {
                if (!this.scroll) {
                  this.scroll = new BScroll(this.$els.listContent, {
                    click: true
                  });
                } else {
                  this.scroll.refresh();
                }
            });
          }
          return show;
      }
    },
    methods: {
      drop(el) {
        for (let i = 0; i < this.balls.length; i++) {
          let ball = this.balls[i];
          if (!ball.show) {
            ball.show = true;
            ball.el = el;
            this.dropBalls.push(ball);
            return;
          }
        }
      },
      toggleList() {
        if (!this.totalCount) {
          return;
        }
        this.fold = !this.fold;
      },
      empty() {
        console.log('aa');
        this.selectFoods.forEach((food) => {
          food.count = 0;
        });
      },
      hideList() {
          this.fold = true;
      },
      pay() {
          if (this.totalPrice < this.minPrice) {
              return;
          }
          window.alert(`支付${this.totalPrice}元`);
      }
    },
    transitions: {
      drop: {
        beforeEnter(el) {
          let count = this.balls.length;
          while (count--) {
            let ball = this.balls[count];
            if (ball.show) {
              let rect = ball.el.getBoundingClientRect();
              let x = rect.left - 32;
              let y = -(window.innerHeight - rect.top - 22);
              el.style.display = '';
              el.style.webkitTransform = `translate3d(0,${y}px,0)`;
              el.style.transform = `translate3d(0,${y}px,0)`;
              let inner = el.getElementsByClassName('inner-hook')[0];
              inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
              inner.style.transform = `translate3d(${x}px,0,0)`;
            }
          }
        },
        enter(el) {
          /* eslint-disable no-unused-vars */
          let rf = el.offsetHeight;
          this.$nextTick(() => {
            el.style.webkitTransform = 'translate3d(0,0,0)';
            el.style.transform = 'translate3d(0,0,0)';
            let inner = el.getElementsByClassName('inner-hook')[0];
            inner.style.webkitTransform = 'translate3d(0,0,0)';
            inner.style.transform = 'translate3d(0,0,0)';
          });
        },
        afterEnter(el) {
          let ball = this.dropBalls.shift();
          if (ball) {
            ball.show = false;
            el.style.display = 'none';
          };
        }
      }
    },
    components: {
      cartcontrol
    }
  };
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"

  .shopcart
    position: fixed
    left:0
    bottom :0
    z-index :50
    width :100%
    height: 48px
    background :#000
    .content
      display: flex
      background :#141d27
      color :rgba(255,255,255,0.4)
      .content-left
        flex :1
        .logo-wrapper
          display :inline-block
          vertical-align :top
          position: relative
          top: -10px
          margin :0 12px
          padding: 6px
          width: 56px
          height: 56px
          box-sizing :border-box
          border-radius :50%
          background :#141d27
          .logo
            width :100%
            height:100%
            border-radius :50%
            background :#2b343c
            text-align :center
            &.highlight
              background :rgb(0,160,220)
            .icon-shopping_cart
              line-height :44px
              font-size :24px
              color :#80858a
              &.highlight
                color :#fff
          .num
            position :absolute
            top:0
            right :0
            width :24px
            height :16px
            text-align :center
            border-radius :16px
            font-size :9px
            font-weight :700
            color :#fff
            background :rgb(240,20,20)
            box-shadow :0 4px 8px 0 rgba(0,0,0,0.4)
        .price
          display :inline-block
          vertical-align :top
          margin-top :12px
          line-height :24px
          padding-right :12px
          box-sizing :border-box
          border-right :1px solid regb(255,255,255,0.1)
          font-size :16px
          font-weight :700
          &.highlight
            color :#fff
        .desc
          display :inline-block
          vertical-align :top
          line-height :24px
          margin-left :12px
          margin :12px 0 0 12px
          font-size :10px
      .content-right
        flex :0 0 105px
        width :105px
        .pay
          height: 48px
          line-height :48px
          text-align :center
          font-size :12px
          font-weight :700
          background :#2b333b
          &.not-enough
            background :#2b333b
          &.enough
            background :#00b43c
            color :#fff
    .ball-container
      .ball
        position: fixed
        left: 32px
        bottom: 22px
        z-index: 200
        transition: all 0.6s cubic-bezier(0.49, -0.29, 0.75, 0.41)
        &.drop-transition
          transition :all 0.4s
          .inner
            width :16px
            height: 16px
            border-radius :50%
            background :rgb(0,160,220)
            transition:all 0.4s

    .shopcart-list
      position :absolute
      left :0
      top :0
      z-index :-1
      width :100%
      &.fold-transition
        transition :all 0.5s
        transform :translate3d(0,-100%,0)
      &.fold-enter,&.fold-leave
        transform :translate3d(0,0,0)
      .list-header
        height: 40px
        line-height :40px
        padding :0 18px
        background :#f3f5f7
        border-bottom :1px solid rgba(7,17,27,0.1)
        .title
          float :left;
          font-size :14px
          color :rgb(7,17,27)
        .empty
          float :right;
          font-size :12px
          color :rgb(0,160,220)
      .list-content
        padding :0 18px
        max-height :217px
        overflow :hidden
        background :#fff
        .food
          position :relative
          padding :12px 0
          box-sizing :border-box
          border-1px(rgba(7,17,27,0.1))
          .name
            line-height :24px
            font-size :14px
            color :rgb(7,17,27)
          .price
            position :absolute
            right :90px
            bottom :12px
            line-height :24px
            font-size :14px
            font-weight :700
            color :rgb(240,20,20)
          .cartControl-wrapper
            position :absolute
            right :0
            bottom :6px
  .list-mask
    position :fixed
    top :0
    left :0
    width :100%
    height :100%
    z-index :40
    backd-filter :blur(10px)
    &.fade-transition
      transition :all 0.5s
      opacity :1
      background :rgba(7,17,27,0.6)
    &.fade-enter,&.fade-leave
      opacity :0
      background :rgba(7,17,27,0)

</style>
